Hi Kev, thanks for posting this - I’ve seen it before via @ian - it’s from the SMART-on-FHIR people, and as far as I can tell it’s clinically fine.
It would need localising to use UK growth charts, which are different to the international/WHO ones from the age of 4 years upwards. We use the UK90 LMS charts (which despite my best efforts remain copyrighted by the Medical Research Council / Royal College of Paediatrics & Child Health).
The company behind this forum, Open Health Hub CIC, has a proper above-board license to use the UK90 data for the growth charts to make digital tools and websites, as long as they are non-profit (as if I would do anything else!) So if you need access and it’s for an open source project then we might be able to find a way to do it under my licence.
I would also say that the UI of the SMART-on-FHIR growth charts looks very different to the UK style growth charts, and I would suggest that a smart move would be to skin the UI to make it look more like the PDF charts that UK clinicians are used to.